A slag-scraping reamer
By designing a slag remover on the reaming drill bit, the problem of slag accumulation was solved, cutting efficiency and tool life were improved, and more efficient construction of large-diameter pile holes in hard rock formations was achieved.
Patent Information
- Application Number
- CN202521698481.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-11
- Publication Date
- 2026-07-07
- Estimated Expiration
- 2035-08-11
AI Technical Summary
In the construction of large-diameter pile holes in hard rock formations, existing reaming drill bits tend to accumulate cutting debris in the annular space between the inner and outer cylinders, resulting in low cutting efficiency and severe wear of the cutting tools at the connecting plate.
A slag-sweeping and hole-enlarging drill bit is designed, equipped with a slag sweeper to clean the debris in the annular space of the drill bit, and to discharge the debris into the inner cylinder in a timely manner through the slag guide port, so as to avoid debris accumulation and improve the construction efficiency and service life of the cutting tool at the connecting plate.
The design of the slag remover effectively cleans up debris in the annular space, improving the overall efficiency of the reaming drill bit and the service life of the cutting tool, while reducing wear.
Smart Images
Figure CN224469107U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of drill bit technology, and more specifically, to a slag-removing and hole-reaming drill bit. Background Technology
[0002] In the construction of large-diameter pile holes in hard rock formations, a small-diameter drill bit is usually used to construct the central hole first, and then an enlarging drill bit is used to break up and enlarge the rock outside the central hole.
[0003] Please refer to Figure 1 The reaming drill bit mainly includes an inner cylinder 20 for guiding and trimming and an outer cylinder 10 for reaming. A connecting plate 30 is provided between the inner and outer cylinders. Cutting tools 40 are provided on the end faces of the inner and outer cylinders and the end face of the connecting plate 30. A slag guide port 21 is provided on the outer periphery of the inner cylinder 20. When the reaming drill bit rotates, the cutting tool 40 cuts and breaks the outer rock, and the slag produced by cutting is discharged into the inner cylinder 20 through the slag guide port 21 and finally discharged through the inner cylinder 20.
[0004] Because the lower end face of the connecting plate 30 is higher than the lower end face of the outer cylinder 10, the cutting plane of the connecting plate 30 of the existing reaming drill bit is higher than the cutting plane of the outer cylinder 10. This causes the debris cut by the outer cylinder 10 to easily accumulate in the annular space between the inner and outer cylinders, resulting in the debris being repeatedly cut and broken. This not only reduces the cutting efficiency but also aggravates the wear problem of the cutting tool 40.
[0005] In summary, how to discharge cutting debris into the inner cylinder more quickly through the slag guide port is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content
[0006] In view of this, the purpose of this utility model is to provide a slag-sweeping and hole-reaming drill bit. The slag sweeper can clean the debris in the annular space of the drill bit and discharge the debris into the inner cylinder in a timely manner through the slag guide port, thereby avoiding debris accumulation, improving the construction efficiency and service life of the cutting tool at the connecting plate, and thus improving the overall efficiency of the hole-reaming drill bit.
[0007] To achieve the above objectives, this utility model provides the following technical solution:
[0008] A slag-sweeping and hole-enlarging drill bit includes a drill bit body, the drill bit body including an inner cylinder and an outer cylinder arranged coaxially, a connecting plate is provided between the inner cylinder and the outer cylinder, a slag sweeper is provided between two adjacent connecting plates, the fixed end of the slag sweeper is connected to the drill bit body, and the free end of the slag sweeper is used to contact the slag fragments in the annular space between the inner and outer cylinders;
[0009] The end of the slag remover that is relatively close to the inner circumferential surface of the outer cylinder is located in front of the end of the slag remover that is relatively close to the outer circumferential surface of the inner cylinder in the direction of drill bit rotation, and the end of the slag remover that is relatively close to the outer circumferential surface of the inner cylinder is located behind the adjacent slag guide port in the direction of drill bit rotation.
[0010] Preferably, the fixed end of the slag sweeper is connected to the inner circumferential surface of the outer cylinder, the free end of the slag sweeper extends radially from the outer cylinder, and the end face of the free end of the slag sweeper is in contact with and fits against the outer circumferential surface of the inner cylinder.
[0011] Preferably, the free end of the slag sweeper extends axially from the outer cylinder, and the end face of the free end of the slag sweeper is a wedge-shaped surface, which is used to contact and fit with the outer peripheral surface of the inner cylinder.
[0012] Preferably, one side of the fixed end of the slag sweeper is connected to the inner circumferential surface of the outer cylinder, the other end of the fixed end of the slag sweeper is connected to the outer circumferential surface of the inner cylinder, and the free end of the slag sweeper extends along the axial direction of the outer cylinder.
[0013] Preferably, the end face of the free end of the slag sweeper is a wedge-shaped surface, and the extension length of the free end of the slag sweeper gradually decreases from the side closer to the inner cylinder to the side closer to the outer cylinder.
[0014] Preferably, the slag sweeper includes at least one slag sweeping unit, the slag sweeping unit includes a brush body and a clamping plate for clamping and fixing the brush body, the clamping plate being connected to the inner circumferential surface of the outer cylinder.
[0015] Preferably, the number and size of the slag-sweeping units of the slag sweeper are the same, and the slag sweeper is evenly arranged along the circumference of the outer cylinder.
[0016] Preferably, the slag sweeper is connected to the inner circumferential surface of the outer cylinder via a slag sweeping mounting plate, the slag sweeping mounting plate is detachably connected to the outer cylinder, and / or the slag sweeping mounting plate is detachably connected to the clamping plate of the slag sweeping unit.
[0017] Preferably, the clamping plates are disposed on both sides of the brush body, and the brush body is bonded between the two clamping plates.
[0018] Preferably, the brush bristle base of the brush body is provided with bolt connection holes, and the clamping plate is provided with bolt mounting holes. The fastening bolt passes through the bolt mounting holes and bolt connection holes of the clamping plate on one side of the brush body and the bolt mounting holes of the clamping plate on the other side of the brush body in sequence and is then connected to the locking nut.
[0019] The slag-sweeping and hole-reaming drill bit provided by this utility model uses a slag sweeper to clean the debris in the annular space between the inner and outer cylinders, preventing the debris generated by the cutting tools of the outer cylinder and connecting plate from accumulating in the annular space. The debris in the annular space is promptly discharged into the inner cylinder through the slag guide port, improving the construction efficiency and service life of the cutting tools at the connecting plate, thereby improving the overall efficiency of the hole-reaming drill bit. Attached Figure Description
[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.
[0021] Figure 1 This is a schematic diagram of the structure of a reaming drill bit in the prior art;
[0022] Figure 2 for Figure 1 A diagram showing the view from below;
[0023] Figure 3 This is a schematic diagram of a specific embodiment of the slag-removing and hole-enlarging drill bit provided by this utility model;
[0024] Figure 4 for Figure 3 A diagram showing the view from below;
[0025] Figure 5 for Figure 3 Working principle diagram;
[0026] Figure 6 for Figure 3 A schematic diagram of the slag sweeper;
[0027] Figure 7 This is a schematic diagram of a specific embodiment two of the slag-removing and hole-reaming drill bit provided by this utility model;
[0028] Figure 8 for Figure 7 Working principle diagram;
[0029] Figure 9 This is a schematic diagram of the structure of a specific embodiment three of the slag-removing and hole-reaming drill bit provided by this utility model;
[0030] Figure 10 for Figure 9 A diagram showing the view from below;
[0031] Figure 11 for Figure 9 Working principle diagram;
[0032] Figure 12 for Figure 9 A schematic diagram of the slag sweeper;
[0033] Figure 13 This is a schematic diagram of the structure of a specific embodiment four of the slag-removing and hole-reaming drill bit provided by this utility model;
[0034] Figure 14 for Figure 13 Working principle diagram;
[0035] Figure 15 for Figure 13 A schematic diagram of the slag sweeper.
[0036] Figures 1-15 middle:
[0037] 10-Outer cylinder; 20-Inner cylinder; 21-Slag guide port; 30-Connecting plate; 40-Cutting tool; 50-Slag sweeper; 51-Slag sweeping unit; 511-Clamping plate; 512-Brush body. Detailed Implementation
[0038] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0039] The core of this utility model is to provide a slag remover that can clean the slag in the annular space of the drill bit and discharge the slag into the inner cylinder in a timely manner through the slag guide port, thereby avoiding slag accumulation, improving the construction efficiency and service life of the cutting tool at the connecting plate, and thus improving the overall efficiency of the reaming drill bit.
[0040] It should be noted that, in this application document, the lower end face refers to the end of the drill bit body located in front of the drill bit in the drilling direction, and the upper end face refers to the end of the drill bit body located behind the drill bit in the drilling direction.
[0041] The "forward" direction of the drill bit's rotation refers to the position that a point on the drill bit's body is about to reach along the direction of the drill bit's rotation, while the "rear" direction refers to the position that a point on the drill bit's body has already passed along the direction of the drill bit's rotation.
[0042] The slag-sweeping and hole-enlarging drill bit provided by this utility model includes a drill bit body, which includes an inner cylinder 20 and an outer cylinder 10 arranged coaxially. A connecting plate 30 is provided between the inner cylinder 20 and the outer cylinder 10. A slag sweeper 50 is provided between two adjacent connecting plates 30. The fixed end of the slag sweeper 50 is connected to the drill bit body, and the free end of the slag sweeper 50 is used to contact the slag fragments in the annular space between the inner and outer cylinders.
[0043] The end of the slag remover 50 that is relatively close to the inner circumferential surface of the outer cylinder 10 is located in front of the end of the slag remover 50 that is relatively close to the outer circumferential surface of the inner cylinder 20 in the direction of drill bit rotation, and the end of the slag remover 50 that is relatively close to the outer circumferential surface of the inner cylinder 20 is located behind the adjacent slag guide port 21 in the direction of drill bit rotation.
[0044] Please refer to Figure 4 and Figure 10 The outer cylinder 10 and inner cylinder 20 of the drill bit body are coaxially arranged, and a connecting plate 30 is provided between the outer cylinder 10 and the inner cylinder 20. The lower end face of the connecting plate 30 is higher than the lower end face of the outer cylinder 10, and the lower end face of the outer cylinder 10 is higher than the lower end face of the inner cylinder 20. The connecting plate 30 is usually evenly arranged along the circumference of the outer cylinder 10.
[0045] Cutting tools 40 are provided on the lower end face of the inner and outer cylinders and the lower end face of the connecting plate 30. The cutting tools 40 are evenly arranged along the circumference of the inner and outer cylinders and along the extension direction of the connecting plate 30. The specific number, type and size of the cutting tools 40 are determined with reference to existing technology according to the actual production needs.
[0046] During construction, the cutting tool 40 on the lower end face of the inner cylinder 20 first contacts and cuts the rock on the outer edge of the central hole, then the cutting tool 40 on the lower end face of the outer cylinder 10 contacts and cuts the rock on the outer edge of the area to be enlarged, and finally the cutting tool 40 on the lower end face of the connecting plate 30 contacts and cuts the rock on the outer side of the central hole.
[0047] To prevent the debris generated by the cutting tool 40 on the lower end face of the outer cylinder 10 from accumulating in the annular space between the inner and outer cylinders and affecting the cutting efficiency and wear of the cutting tool 40 on the lower end face of the connecting plate 30, a slag remover 50 is provided between two adjacent connecting plates 30 in the annular space. When the reaming drill bit rotates, the slag remover 50 is used to clean the debris in the annular space and discharge the debris into the inner cylinder 20 through the slag guide port 21 of the inner cylinder 20.
[0048] The end of the slag remover 50 that is connected to the drill bit body is a fixed end, and the end that is in contact with the slag is a free end. When the drill bit rotates actively, the free end of the slag remover 50 can swing forward and backward along the direction of the drill bit rotation, thereby cleaning the slag that comes into contact with it.
[0049] The fixed end of the slag remover 50 can be connected to the inner circumferential surface of the outer cylinder 10, such as... Figure 5 and Figure 8 As shown; it can also be connected to the outer circumferential surface of the inner cylinder 20, and the radial extension of the slag sweeper 50 can be achieved through a C-shaped slag sweeping mounting plate, or the axial installation of the slag sweeper 50 can be achieved through an L-shaped slag sweeping mounting plate; it can also be connected to both the inner circumferential surface of the outer cylinder 10 and the outer circumferential surface of the inner cylinder 20, such as Figure 11 and Figure 14 As shown.
[0050] In order to prevent the debris generated by the cutting tool 40 on the lower end face of the outer cylinder 10 from accumulating in front of the cutting tool 40 on the lower end face of the connecting plate 30 in the drilling direction, the free end of the debris sweeper 50 is set lower than or flush with the cutting tool 40 on the lower end face of the connecting plate 30, so that the debris sweeper 50 can contact the debris earlier than the cutting tool 40 of the connecting plate 30, or at least contact the debris at the same time as the cutting tool 40.
[0051] Considering that the debris needs to be discharged from the annular space into the inner cylinder 20 through the slag guide port 21, the end of the slag sweeper 50 that is relatively close to the outer circumferential surface of the inner cylinder 20 is located in front of the rotation direction of the adjacent slag guide port 21, and the end of the slag sweeper 50 that is relatively close to the inner circumferential surface of the outer cylinder 10 is located in front of the rotation direction of the end of the slag sweeper 50 that is relatively close to the outer circumferential surface of the inner cylinder 20. This makes the rotation direction of the slag sweeper 50 the same as the rotation direction of the drill bit body, which is conducive to guiding the debris outside the annular space to the inside, and then discharging it into the inner cylinder 20 through the slag guide port 21.
[0052] It should be noted that the end of the slag sweeper 50 that is relatively close to the outer circumference of the inner cylinder 20 can be either the fixed end or the free end of the slag sweeper 50, depending on the installation method of the slag sweeper 50.
[0053] For example, when the slag remover 50 extends radially along the outer cylinder 10, the end of the slag remover 50 that is closer to the outer circumferential surface of the inner cylinder 20 is a free end, such as... Figure 5 and Figure 6 As shown; when the slag remover 50 extends axially along the outer cylinder 10, the end of the slag remover 50 closest to the outer circumferential surface of the inner cylinder 20 is a fixed end, such as... Figure 11 and Figure 12 As shown.
[0054] The slag remover 50 can be specifically configured as a metal brush, nylon brush, rubber brush, etc. The connection method between the slag remover 50 and the drill bit body is determined according to the type of slag remover 50, which will not be elaborated here.
[0055] In this embodiment, the slag-sweeping reaming drill bit uses a slag sweeper 50 to clean the debris in the annular space between the inner and outer cylinders, preventing the debris generated by the cutting tools 40 of the outer cylinder 10 and connecting plate 30 from accumulating in the annular space. The debris in the annular space is promptly discharged into the inner cylinder 20 through the slag guide port, improving the construction efficiency and service life of the cutting tools 40 at the connecting plate 30, thereby improving the overall efficiency of the reaming drill bit.
[0056] Regarding the installation direction of the slag sweeper 50, please refer to... Figure 3 and Figure 6 The fixed end of the slag sweeper 50 can be connected to the inner circumferential surface of the outer cylinder 10, and the free end of the slag sweeper 50 extends radially from the outer cylinder 10. The end face of the free end of the slag sweeper 50 is in contact with and fits against the outer circumferential surface of the inner cylinder 20.
[0057] When the drill bit body rotates, it drives the fixed end of the slag remover 50 to rotate synchronously. Simultaneously, the free end of the slag remover 50 swings back and forth relative to the fixed end, thereby using the slag remover 50 to discharge the debris in the annular space through the slag guide port 21. Figure 5 As shown.
[0058] Preferably, in order to increase the contact area between the free end of the slag remover 50 and the outer peripheral surface of the inner cylinder 20 to improve the slag removal effect, the free end of the slag remover 50 can be configured to extend axially in the direction of the outer cylinder 10, and the end face of the free end of the slag remover 50 can be a wedge-shaped surface. The wedge-shaped surface is used to contact and fit with the outer peripheral surface of the inner cylinder 20, so as to increase the contact area between the slag remover 50 and the outer peripheral surface of the inner cylinder 20 without changing the width of the slag remover 50. Figure 7 and Figure 8 As shown.
[0059] The width of the aforementioned slag sweeper 50 is the dimension of the slag sweeper 50 in the vertical direction of the extension direction of the free end in the vertical plane. The vertical plane is parallel to the axis of the outer cylinder 10, and the horizontal plane is perpendicular to the axis of the outer cylinder 10.
[0060] Under the premise that the width of the slag remover 50 remains unchanged, the larger the pitch angle α between the extension direction of the slag remover 50 and the horizontal plane (0≤α<90°), the larger the area of the wedge-shaped surface of the slag remover 50 that contacts the outer circumference of the inner cylinder 20. The larger the contact area, the better the slag removal effect. At the same time, the increase of the pitch angle α between the slag remover 50 and the horizontal plane will also increase the assembly difficulty of the slag remover 50 and the drill bit body.
[0061] Please refer to Figure 9 , Figure 10 and Figure 12One side of the fixed end of the slag sweeper 50 can be connected to the inner circumferential surface of the outer cylinder 10, and the other side of the fixed end of the slag sweeper 50 can be connected to the outer circumferential surface of the inner cylinder 20. The free end of the slag sweeper 50 extends along the axial direction of the outer cylinder 10.
[0062] At this time, the free end of the slag remover 50 is set parallel to the walls of the inner and outer cylinders. When the drill bit body rotates, the drill bit body drives the fixed end of the slag remover 50 to rotate synchronously. The free end of the slag remover 50 swings back and forth relative to the fixed end, thereby using the slag remover 50 to discharge the debris in the annular space through the slag guide port 21. Figure 11 As shown.
[0063] Compared to radially or obliquely extended slag remover 50, axially arranged slag remover 50 can further increase the contact area between slag remover 50 and slag, improve the slag removal efficiency and quality of the annular space, thereby ensuring the cutting efficiency of the cutting tool 40 on the lower end face of the connecting plate 30, and reducing the wear of the cutting tool 40 and increasing its service life.
[0064] Preferably, considering the distribution of debris within the annular space, the end face of the free end of the slag sweeper 50 can be set as a wedge-shaped surface, and the extension length of the free end of the slag sweeper 50 gradually decreases from the side closer to the inner cylinder 20 to the side closer to the outer cylinder 10, such as... Figure 13-15 As shown, this is so that the slag removal efficiency and effect can be improved by adjusting the radial distribution of the axial length of the free end of the slag remover 50 without changing the volume of the slag remover 50.
[0065] Based on the above embodiments, the structure of the slag sweeper 50 is defined. The slag sweeper 50 includes at least one slag sweeping unit 51. The slag sweeping unit 51 includes brushes 512 arranged in parallel and a clamping plate 511 for clamping and fixing the brushes 512. The clamping plate 511 is connected to the outer peripheral surface of the outer cylinder 10.
[0066] Among them, the brush body 512 is the cleaning element of the slag sweeper 50. The brush body 512 is provided with several parallel bristles. The material of the bristles is determined according to the size and composition of the debris produced by the cutting tool 40.
[0067] The bristles are usually made of wear-resistant steel wire to meet the need for removing hard debris. In order to clamp and fix the brush body 512, the base of the bristles of the brush body 512 is provided with bolt connection holes, and the clamping plate 511 is provided with bolt mounting holes. The fastening bolt passes through the bolt mounting holes and bolt connection holes of the clamping plate 511 on one side of the brush body 512 and the bolt mounting holes of the clamping plate 511 on the other side of the brush body 512 in sequence and is connected to the lock nut. Of course, the bolt connection can also be replaced by riveting.
[0068] In addition, for debris generated during drilling in softer formations, the bristles can be made of nylon or rubber, which have good elasticity and cause less wear on the outer circumference of the inner cylinder 20 when the brush body 512 swings back and forth. Usually, clamping plates 511 are set on both sides of the brush body 512, and the brush body 512 is bonded to the clamping plates 511 on both sides, or the brush body 512 is fixed by the slots of the clamping plates 511.
[0069] The brush body 512 of the slag sweeper 50 will wear out after long-term contact with the debris, which will affect the slag sweeper 50's cleaning efficiency and cleaning effect. Therefore, the slag sweeper 50 needs to be inspected regularly and the worn-out slag sweeper 50 should be replaced in time.
[0070] To facilitate the replacement of the slag-sweeping unit 51 inside the slag sweeper 50, preferably, the clamping plates 511 of the slag sweeper 50 can be connected to the inner circumferential surface of the outer cylinder 10 through the slag-sweeping mounting plate, and the slag-sweeping mounting plate and the outer cylinder 10 can be detachably connected, and / or the slag-sweeping mounting plate and the clamping plate 511 can be detachably connected.
[0071] The slag removal mounting plate is detachably connected to the outer cylinder 10, enabling the overall disassembly and replacement of the slag remover 50; the slag removal mounting plate is detachably connected to the clamping plate 511 of a single slag removal unit 51, enabling the replacement of a single slag removal unit 51, which results in lower maintenance costs compared to overall replacement.
[0072] The detachable connection between the slag sweeping mounting plate of the slag sweeper 50 and the outer cylinder 10, and between the clamping plate 511 of the slag sweeping unit 51 and the slag sweeping mounting plate, can be set to common connection methods such as bolt connection and pin connection.
[0073] The width and number of each slag-sweeping unit 51 within the slag-sweeping device 50 both affect the slag-sweeping effect of the slag-sweeping device 50. When the number of slag-sweeping units 51 within the slag-sweeping device 50 is small and / or the width of the slag-sweeping units 51 is small, such that the total width of the slag-sweeping device 50 is less than the annular width of the annular space, for example... Figure 3 When the slag sweeper 50 shown has only one slag sweeping unit 51, it is preferable to set the brush body 512 to have a radial extension of the outer cylinder 10. By setting it radially or inclined, the brush body 512 can cover the inner space of the annular space.
[0074] When the total width of the slag sweeper 50 is equal to the circumferential width of the annular space, it is preferable to arrange the brush body 512 to extend along the axial direction of the outer cylinder 10. In this case, if the slag sweeper 50 is provided with two or more slag sweeping units 51, in addition to the following... Figure 10 As shown, the clamping plates 511 of each slag-sweeping unit 51 are collinear in the horizontal plane. Alternatively, the clamping plates 511 of two adjacent slag-sweeping units 51 can be set to have a certain horizontal angle. The value of the horizontal angle is determined based on actual experiments or simulation calculations to obtain a better slag-sweeping effect.
[0075] Preferably, in order to facilitate the installation of the slag remover 50 and improve the interchangeability of each slag remover 50 in the reaming drill bit, the number and size of the slag removal units 51 of the slag remover 50 are set to be the same, and the slag removers 50 are evenly arranged along the circumference of the outer cylinder 10, so as to avoid uneven distribution of the slag removers 50, which would cause local slag accumulation in the annular space and thus affect the cutting efficiency and service life of the cutting tool 40 on the lower end face of the connecting plate 30 in the corresponding position.
[0076] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.
[0077] The above provides a detailed description of the slag-removing and hole-reaming drill bit provided by this utility model. Specific examples have been used to illustrate the principle and implementation of this utility model. The descriptions of the embodiments above are merely for the purpose of helping to understand the method and core idea of this utility model. It should be noted that those skilled in the art can make various improvements and modifications to this utility model without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this utility model.
Claims
1. A slag-removing and hole-reaming drill bit, comprising a drill bit body, the drill bit body comprising an inner cylinder (20) and an outer cylinder (10) coaxially arranged, a connecting plate (30) being provided between the inner cylinder (20) and the outer cylinder (10), characterized in that, A slag remover (50) is provided between two adjacent connecting plates (30). The fixed end of the slag remover (50) is connected to the drill bit body, and the free end of the slag remover (50) is used to contact the slag in the annular space between the inner and outer cylinders. The end of the slag remover (50) that is relatively close to the inner circumferential surface of the outer cylinder (10) is located in front of the end of the slag remover (50) that is relatively close to the outer circumferential surface of the inner cylinder (20) in the direction of drill bit rotation, and the end of the slag remover (50) that is relatively close to the outer circumferential surface of the inner cylinder (20) is located behind the adjacent slag guide port (21) in the direction of drill bit rotation.
2. The slag-removing and hole-reaming drill bit according to claim 1, characterized in that, The fixed end of the slag remover (50) is connected to the inner circumferential surface of the outer cylinder (10), and the free end of the slag remover (50) extends radially from the outer cylinder (10). The end face of the free end of the slag remover (50) is in contact with and fits against the outer circumferential surface of the inner cylinder (20).
3. The slag-removing and hole-reaming drill bit according to claim 2, characterized in that, The free end of the slag remover (50) extends axially from the outer cylinder (10), and the end face of the free end of the slag remover (50) is a wedge-shaped surface, which is used to contact and fit with the outer peripheral surface of the inner cylinder (20).
4. The slag-removing and hole-reaming drill bit according to claim 1, characterized in that, One side of the fixed end of the slag sweeper (50) is connected to the inner circumferential surface of the outer cylinder (10), and the other end of the fixed end of the slag sweeper (50) is connected to the outer circumferential surface of the inner cylinder (20). The free end of the slag sweeper (50) extends along the axial direction of the outer cylinder (10).
5. The slag-removing and hole-reaming drill bit according to claim 4, characterized in that, The end face of the free end of the slag remover (50) is a wedge-shaped surface, and the extension length of the free end of the slag remover (50) gradually decreases from the side closer to the inner cylinder (20) to the side closer to the outer cylinder (10).
6. The slag-removing and hole-reaming drill bit according to any one of claims 1-5, characterized in that, The slag remover (50) includes at least one slag removal unit (51), the slag removal unit (51) includes a brush body (512) and a clamping plate (511) for clamping and fixing the brush body (512), the clamping plate (511) being connected to the inner circumferential surface of the outer cylinder (10).
7. The slag-removing and hole-reaming drill bit according to claim 6, characterized in that, The number and size of the slag-sweeping units (51) of the slag sweeper (50) are the same, and the slag sweeper (50) is uniformly arranged along the circumference of the outer cylinder (10).
8. The slag-removing and hole-reaming drill bit according to claim 6, characterized in that, The clamping plates (511) are all connected to the inner circumferential surface of the outer cylinder (10) through the slag removal mounting plate. The slag removal mounting plate is detachably connected to the outer cylinder (10), and / or the slag removal mounting plate is detachably connected to the clamping plate (511).
9. The slag-removing and hole-reaming drill bit according to claim 6, characterized in that, The clamping plates (511) are disposed on both sides of the brush body (512), and the brush body (512) is bonded between the clamping plates (511) on both sides.
10. The slag-removing and hole-reaming drill bit according to claim 6, characterized in that, The brush body (512) has a bolt connection hole at the base of the bristles, and the clamping plate (511) has a bolt mounting hole. The fastening bolt passes through the bolt mounting hole and the bolt connection hole of the clamping plate (511) on one side of the brush body (512) and the bolt mounting hole of the clamping plate (511) on the other side of the brush body (512) and then connects to the locking nut.